Q.

Condensed structural formula of propane is?


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a

CH3 – CH2 – CH3

b

CH2 – CH3 – CH3

c

CH2 – CH4 – CH2

d

None of the above 

answer is A.

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Detailed Solution

Concept- Chemical bonds connecting the atoms of a molecule are located in structural formulae. A structural formula consists of symbols for the atoms connected by short lines that represent chemical bonds—one, two, or three lines standing for single, double, or triple bonds, respectively.
A condensed structural formula is the one in which we write the structure in a line of text. It shows all the atoms excluding the vertical bonds. Propane has the chemical formula C3H8.
According to the rules, we know that a carbon atom can form only 4 bonds. Therefore, the structural formula CH3 – CH2 – CH3 satisfies all the valences of the carbon atom.
Hence, option 1 is the correct answer.
 
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